Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 691: | \[{4^{691}-1\over3}\] | 4668478921<10> × 906642603313<12> × 9633758284523287289<19> × 10488160032325844521<20> × 2833637724427940664433391497<28> × 5456646931831786367242204139<28> × 16636201944470267267182958207<29> × 53568019129739502623243476233360296971<38> × 260497260435653463674393559361944843526192039079322597725975982188833765590706425090967325647096876954737828863203<114> × 22918862886543542550497013689794549380986252187467410793440853162884227395126178667668709323949107483968180609969160895841<122> |